Document Detail


No effect of carbohydrate-protein on cycling performance and indices of recovery.
MedLine Citation:
PMID:  19997018     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
PURPOSE: The aim of this study was to determine whether adding protein to a CHO beverage would improve late-exercise cycle time-trial performance over CHO alone. Furthermore, we examined the effects of coingesting protein with CHO during exercise on postexercise markers of sarcolemmal disruption and the recovery of muscle function. METHODS: In a double-blind, crossover design, 12 trained male cyclists performed 120 min of steady-state (SS) cycling at approximately 55% VO2max followed by a time trial lasting approximately 1 h. At 15-min intervals during SS exercise, participants consumed either a CHO or a CHO + protein (CHO + Pro) beverage (providing 65 g x h(-1) CHO or 65 g x h(-1) CHO plus 19 g x h(-1) protein). Twenty-four hours after the onset of the SS cycle, participants completed a maximum isometric strength test. At rest and 24 h postexercise, a visual analog scale was used to determine lower-limb muscle soreness, and blood samples were obtained for plasma creatine kinase concentration. Dietary control was implemented 24 h before and during the time course of each trial. RESULTS: Average power output sustained during time trial was similar for CHO and CHO + Pro, with no effect of treatment on the time to complete the time trial (60:13 +/- 1:33 and 60:51 +/- 2:40 (min:s) for CHO and CHO + Pro, respectively). Postexercise isometric strength significantly declined for CHO (15% +/- 3%) and CHO + Pro (11% +/- 3%) compared with baseline (486 +/- 28 N). Plasma creatine kinase concentrations, and visual analog scale soreness significantly increased at 24 h postexercise, with no difference between treatments. CONCLUSIONS: The present findings suggest that CHO + Pro coingestion during exercise does not improve late-exercise time-trial performance, ameliorate markers of sarcolemmal disruption, or enhance the recovery of muscle function at 24 h postexercise over CHO alone.
Authors:
Leigh Breen; Kevin D Tipton; Asker E Jeukendrup
Related Documents :
9480948 - Influence of differing macronutrient intakes on muscle glycogen resynthesis after resis...
17953468 - Exploring the potential ergogenic effects of glycerol hyperhydration.
10822908 - Pre-exercise carbohydrate and fluid ingestion: influence of glycemic response on 10-km ...
18615388 - Pre-exercise carbohydrate status influences carbohydrate-mediated attenuation of post-e...
7785008 - Expiratory muscle training and sensation of respiratory effort during exercise in norma...
21058588 - Effect of pre- and postcompetition emotional state on salivary cortisol in top-ranking ...
Publication Detail:
Type:  Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  42     ISSN:  1530-0315     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2010 Jun 
Date Detail:
Created Date:  2010-05-20     Completed Date:  2010-09-10     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1140-8     Citation Subset:  IM; S    
Affiliation:
School of Sport and Exercise Sciences, University of Birmingham, Birmingham, United Kingdom.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Adult
Cross-Over Studies
Dietary Carbohydrates*
Dietary Proteins*
Dietary Supplements*
Double-Blind Method
Exercise / physiology*
Exercise Test*
Exercise Tolerance
Humans
Male
Young Adult
Chemical
Reg. No./Substance:
0/Dietary Carbohydrates; 0/Dietary Proteins

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Force-Velocity Relationship in Cycling Revisited: Benefit of Two-Dimensional Pedal Forces Analysis.
Next Document:  Body Composition and Strength Changes in Women with Milk and Resistance Exercise.